An agglomerator for the production of fumed silica

Abstract

The utility model belongs to the production equipment technical field of fumed silica, specifically a kind of for the agglomerator of fumed silica production, the both ends of inner tube are material inlet and material outlet respectively, and the inner space of inner tube between material inlet and material outlet is material flow cavity, and the heat exchange medium cavity is formed between inner tube and jacket, and heat exchange medium inlet and outlet are equipped on jacket and are communicated with heat exchange medium cavity;The inner surface of inner tube is fixedly connected with helical flow guide vane, and the pitch between helical flow guide vane is all equipped with a group of turbulence protrusions fixed on the inner surface of inner tube;Multiple baffles are arranged between inner tube and jacket along the flow direction of heat exchange medium, each baffle is fixedly connected on the inner surface of jacket, and gap is left between the outer surface of inner tube, and flow-through hole is formed on each baffle;Gas distributor is installed in material inlet.The utility model has the beneficial effects of improving product quality, optimizing cooling and agglomeration effect, energy saving and consumption reduction, and excellent equipment performance.

Description

Technical Field

[0001] This utility model belongs to the technical field of equipment for the production of fumed silica, specifically an aggregator for the production of fumed silica. Background Technology

[0002] Fumed silica, due to its high specific surface area and excellent reinforcing and thickening properties, is widely used in many fields. As a key piece of equipment in the production process, the performance of the aggregator directly affects product quality.

[0003] Existing aggregators have many problems, including:

[0004] (1) Some aggregators adopt a disc-type pipe design, which leads to more collisions between the product and the pipe wall, increased impurities and faster equipment wear.

[0005] (2) The cooling method is unreasonable, the temperature change gradient is large and uneven, which makes the product aggregation unstable.

[0006] (3) High energy consumption and poor heat recovery and utilization increase production costs.

[0007] (4) Insufficient control over the aggregation process of fumed silica particles makes it difficult to accurately regulate the particle size distribution and aggregation state of the product. Utility Model Content

[0008] In view of the above-mentioned problems of existing aggregators, the purpose of this utility model is to provide an aggregator for the production of fumed silica.

[0009] The objective of this utility model is achieved through the following technical solution:

[0010] This utility model includes an inner cylinder and a jacket located outside the inner cylinder. The two ends of the inner cylinder are a material inlet and a material outlet, respectively. The internal space of the inner cylinder between the material inlet and the material outlet is a material flow cavity. A heat exchange medium cavity is formed between the inner cylinder and the jacket. The jacket is provided with a heat exchange medium inlet and outlet communicating with the heat exchange medium cavity. A guide vane is fixedly connected to the inner surface of the inner cylinder. The guide vane is spiral in the direction of material flow. A set of turbulence protrusions fixed to the inner surface of the inner cylinder is provided between the pitch of the spiral guide vane. Multiple baffles are provided between the inner cylinder and the jacket along the direction of heat exchange medium flow. Each baffle is fixed to the inner surface of the jacket and has a gap between it and the outer surface of the inner cylinder. Each baffle is provided with a flow hole. A gas distributor is installed in the material inlet.

[0011] Wherein: each group of the turbulence protrusions consists of multiple protrusions evenly arranged along the circumference, and each turbulence protrusion is hemispherical.

[0012] The baffle is annular, with its outer ring fixed to the inner surface of the jacket, and a gap between the inner ring of the baffle and the outer surface of the inner cylinder.

[0013] The collector is U-shaped with two horizontal openings. The heat exchange medium inlet and outlet include a main hot water inlet and a main steam outlet. The main hot water inlet is installed in the lower part of the jacket and communicates with the heat exchange medium cavity near the material inlet. The main steam outlet is installed in the upper part of the jacket and communicates with the heat exchange medium cavity near the material outlet. The main hot water inlet and the main steam outlet are diagonally distributed.

[0014] The jacket is provided with an auxiliary hot water inlet at its front end, and the temperature of the hot water entering through the auxiliary hot water inlet is lower than that of the hot water entering through the main hot water inlet.

[0015] The auxiliary hot water inlet is installed at the lower part of the jacket, and the auxiliary hot water inlet is located at the front end of the main hot water inlet in the material flow direction, and is connected to the heat exchange medium cavity near the material inlet; an auxiliary steam outlet is also provided between the two openings of the "U" shaped collector, and the auxiliary steam outlet is connected to the heat exchange medium cavity near the material inlet.

[0016] Temperature sensors and pressure sensors are respectively installed on the jacket.

[0017] The advantages and positive effects of this utility model are as follows:

[0018] Compared with existing aggregators, this utility model has beneficial effects such as improving product quality, optimizing cooling and aggregating effects, saving energy and reducing consumption, and providing superior equipment performance. Specifically:

[0019] 1. Improve product quality:

[0020] (a) The inner cylinder is made of TA2 material, which has strong corrosion resistance, reduces impurities caused by equipment corrosion, and improves product purity; the spiral guide vanes inside the inner cylinder guide the particles to flow in a spiral, increase the collision between particles, and reduce the collision with the cylinder wall; the turbulence protrusions further disrupt the flow state, making the particles mix more fully and improving the uniformity of aggregation.

[0021] (b) The gas distributor at the feed inlet ensures uniform dispersion of fumed silica, further improving product quality.

[0022] 2. Optimize cooling and energy concentration effects:

[0023] (a) The main hot water inlet and auxiliary hot water inlet on the jacket enable multi-gradient cooling with a reasonable temperature gradient, ensuring stable aggregation of fumed silica and facilitating precise control of product particle size distribution and aggregation state.

[0024] (b) The annular baffles inside the jacket extend the residence time of the heat exchange medium, enhance the heat exchange effect, make the temperature distribution inside the inner cylinder more uniform, and improve the cooling and concentration effect.

[0025] 3. Energy saving and consumption reduction: By controlling temperature and pressure, the flow rate and pressure of the heat exchange medium are adjusted to achieve effective heat recovery and utilization; the steam discharged from the main steam outlet and auxiliary steam outlet can be used in other process links, reducing energy consumption and production costs.

[0026] 4. Excellent equipment performance:

[0027] (a) This utility model adopts an integral structure design, with the inner cylinder made of TA2 material and the jacket made of carbon steel material, taking into account both corrosion resistance and structural strength, extending the service life of the equipment. The annular baffle plate strengthens the jacket strength, making the equipment operation more stable.

[0028] (b) The structural design of each component is reasonable, and the installation and maintenance are convenient, which reduces equipment maintenance costs and improves production efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 for Figure 1 View A in the middle;

[0031] Figure 3 for Figure 2 View B in the middle;

[0032] Figure 4 for Figure 1 C-C section view in the middle;

[0033] Wherein: 1 is the inner cylinder, 2 is the jacket, 3 is the guide vane, 4 is the turbulence protrusion, 5 is the baffle plate, 6 is the gas distributor, 7 is the tie rod, 8 is the connecting flange, 9 is the material inlet, 10 is the material outlet, 11 is the main hot water inlet, 12 is the auxiliary hot water inlet, 13 is the main steam outlet, 14 is the auxiliary steam outlet, 15 is the temperature sensor, 16 is the pressure sensor, and 17 is the flow hole. Detailed Implementation

[0034] The invention will now be described in further detail with reference to the accompanying drawings.

[0035] like Figures 1-4As shown, this utility model includes an inner cylinder 1 and a jacket 2 located outside the inner cylinder 1. The two ends of the inner cylinder 1 are a material inlet 9 and a material outlet 10, respectively. The internal space of the inner cylinder 1 between the material inlet 9 and the material outlet 10 is a material flow cavity. A heat exchange medium cavity is formed between the inner cylinder 1 and the jacket 2. The jacket 2 is provided with a heat exchange medium inlet and outlet that communicate with the heat exchange medium cavity. A guide vane 3 is fixedly connected to the inner surface of the inner cylinder 1. The guide vane 3 is spiral in the direction of material flow. A set of turbulence protrusions 4 fixed to the inner surface of the inner cylinder 1 is provided between the pitch of the spiral guide vane 3. Multiple baffles 5 are provided between the inner cylinder 1 and the jacket 2 along the direction of heat exchange medium flow. Each baffle 5 is fixedly connected to the inner surface of the jacket 2 and has a gap with the outer surface of the inner cylinder 1. Each baffle 5 is provided with a flow hole 17. A gas distributor 6 is installed in the material inlet 9.

[0036] The collector in this embodiment is U-shaped with two horizontal openings. Correspondingly, the inner cylinder 1 and the jacket 2 in this embodiment are both hollow U-shaped, forming a closed heat exchange medium cavity between the inner cylinder 1 and the jacket 2. Only the heat exchange medium inlet and outlet are connected to the heat exchange medium cavity.

[0037] In this embodiment, the inner cylinder 1 is made of Take (titanium alloy), and the jacket 2 is made of carbon steel. Take (titanium alloy) has excellent corrosion resistance, adapting to the complex environment of the fumed silica production process, reducing corrosion of the inner cylinder, and extending the equipment's service life. The carbon steel jacket 2 is low-cost and high-strength, providing good support and protection for the overall structure. A closed heat exchange medium cavity is formed between the inner cylinder 1 and the jacket 2 for introducing the heat exchange medium for heat exchange.

[0038] In this embodiment, the guide vane 3 is made of TA2 material, the same material as the inner cylinder 1, which avoids electrochemical corrosion caused by material differences. The spiral angle of the guide vane 3 can be designed according to production requirements, and can be between 30° and 60°. The spiral guide vane 3 can guide the fumed silica particles to form a spiral flow inside the inner cylinder 1, increasing the probability of collision between particles and promoting particle aggregation.

[0039] In this embodiment, each set of turbulence protrusions 4 consists of multiple protrusions evenly arranged along the circumference, and each turbulence protrusion 4 is hemispherical. The turbulence protrusions 4 in this embodiment are also made of TA2 material, and their height can range from 10 to 50 mm. The turbulence protrusions 4 can further disrupt the flow state of the fumed silica particles, making the mixing between particles more thorough and improving the uniformity of aggregation.

[0040] In this embodiment, the baffle 5 is annular. The outer ring of the baffle 5 is fixed to the inner surface of the jacket 2, and a gap is left between the inner ring of the baffle 5 and the outer surface of the inner cylinder 1. The baffle 5 is made of carbon steel, the same material as the jacket 2. Multiple flow holes 17 are provided on the baffle 5, with a diameter of 10-15 mm, and are evenly distributed. The annular baffle 5 can change the flow path of the heat exchange medium in the heat exchange medium cavity, prolong the residence time of the heat exchange medium, enhance the heat exchange effect, and at the same time, it can also strengthen the structural strength of the jacket 2.

[0041] In this embodiment, the heat exchange medium inlet and outlet include a main hot water inlet 11 and a main steam outlet 13. The main hot water inlet 11 is installed on the lower side of the jacket 2 and communicates with the heat exchange medium cavity near the material inlet 9. The main steam outlet 13 is installed on the upper side of the jacket 2 and communicates with the heat exchange medium cavity near the material outlet 10. The main hot water inlet 11 and the main steam outlet 13 are diagonally distributed, so that the heat exchange medium can flow fully in the heat exchange cavity and improve the heat exchange efficiency.

[0042] In this embodiment, two auxiliary hot water inlets 12 are provided at the front end of the jacket 2 (i.e., the end near the material inlet 9). Both auxiliary hot water inlets 12 are located at the lower part of the jacket 2, and the auxiliary hot water inlets 12 are located in front of the main hot water inlet 11 in the material flow direction, and are connected to the heat exchange medium cavity near the material inlet 9. The hot water temperature introduced into the auxiliary hot water inlet 12 is lower than the hot water temperature introduced into the main hot water inlet 11. In this embodiment, the hot water temperature introduced into the auxiliary hot water inlet 12 is 75℃~80℃, and the hot water temperature introduced into the main hot water inlet 11 is 80℃~90℃. This setting achieves multi-gradient cooling, which is beneficial to the stable aggregation of fumed silica.

[0043] Since the front end of the jacket 2 is relatively short, in order to reduce the temperature here, this embodiment also provides two auxiliary steam outlets 14 between the two openings of the "U"-shaped collector. The auxiliary steam outlets 14 are connected to the heat exchange medium cavity near the material inlet 9.

[0044] In this embodiment, the gas distributor 6 is a commercially available product, specifically a static mixer SV-3.5 type manufactured by Nantong Fang Sheng Petrochemical Equipment Co., Ltd. The gas distributor 6 has a bent plate structure, is made of TA2 material, and is positioned on the equipment flange via tie rods 7, ensuring a level installation and reliable fixation. The gas distributor 6 ensures uniform dispersion of the gaseous silica entering the inner cylinder 1, preventing excessively high local concentrations and guaranteeing the stability of the aggregation process.

[0045] In this embodiment, a temperature sensor 15 and a pressure sensor 16 are respectively installed on the jacket 2. The temperature sensor 15 is used to monitor the temperature inside the heat exchange medium cavity, and the pressure sensor 16 is used to monitor the pressure inside the heat exchange medium cavity. At the same time, regulating valves are provided at each heat exchange medium inlet and outlet. Based on the signals fed back by the temperature sensor 15 and the pressure sensor 16, the flow rate and pressure of the medium at each heat exchange medium inlet and outlet are adjusted to achieve precise control of the heat exchange process and ensure the stability of the temperature gradient inside the inner cylinder 1.

[0046] This utility model adopts an integral structure, comprising an inner cylinder 1 made of A2 material and a jacket 2 made of carbon steel. Through innovative structural design, it solves many problems of existing aggregators, achieving efficient and high-quality production of fumed silica. Specifically:

[0047] A. The inner cylinder 1 and the jacket 2 are tightly connected without leakage; confirm that the spiral guide vane 3 and the turbulence protrusion 4 inside the inner cylinder 1 are firmly installed and accurately positioned.

[0048] B. Check the annular baffle 5 on the jacket 2 to ensure that the connection between the baffle 5 and the inner surface of the jacket 2 is stable and that the flow hole 17 is not blocked.

[0049] C. Install the gas distributor 6 at the material inlet 9, and position it on the equipment flange using the tie rod 7, ensuring that it is installed flat and securely fixed.

[0050] D. Connect the flanges 8 at the inlet and outlet of each heat exchange medium, install the temperature sensor 15, pressure sensor 16 and regulating valve, and calibrate them to ensure they are working properly.

[0051] E. Start the heat exchange medium supply system, allowing hot water to enter the heat exchange medium chamber between the inner cylinder 1 and the jacket 2 from the main hot water inlet 11 and the auxiliary hot water inlet 12, respectively. Monitor the temperature and pressure inside the heat exchange medium chamber using temperature sensor 15 and pressure sensor 16, and adjust the regulating valves to control the flow rate and pressure of the hot water.

[0052] F. Fumed silica enters the inner cylinder 1 from the material inlet 9. After being evenly dispersed by the gas distributor 6, it flows in a spiral manner under the guidance of the spiral guide plate 3. During the flow, it collides with the inner surface of the inner cylinder 1 and other particles. At the same time, it is mixed more thoroughly and gradually aggregates due to the effect of the turbulence protrusion 4.

[0053] G. The heat exchange medium is affected by the annular baffle 5 in the heat exchange medium cavity, which changes the flow path and prolongs the residence time, so as to fully exchange heat with the gaseous silica in the inner cylinder 1 and realize multi-gradient cooling; the steam after heat exchange is discharged from the main steam outlet 13 and enters the subsequent recycling stage.

[0054] H. The aggregated fumed silica is discharged from material outlet 10 and enters the next production stage.

Claims

1. An aggregator for the production of fumed silica, characterized in that: The system includes an inner cylinder (1) and a jacket (2) located outside the inner cylinder (1). The two ends of the inner cylinder (1) are a material inlet (9) and a material outlet (10), respectively. The internal space of the inner cylinder (1) between the material inlet (9) and the material outlet (10) is a material flow cavity. A heat exchange medium cavity is formed between the inner cylinder (1) and the jacket (2). The jacket (2) is provided with a heat exchange medium inlet and outlet that communicate with the heat exchange medium cavity. A guide vane (3) is fixed to the inner surface of the inner cylinder (1). The guide vane (3) flows along the material flow... The direction of movement is spiral, and a set of turbulence protrusions (4) fixed to the inner surface of the inner cylinder (1) are provided between the pitches of the spiral guide vanes (3); multiple baffles (5) are provided between the inner cylinder (1) and the jacket (2) along the flow direction of the heat exchange medium, each baffle (5) is fixed to the inner surface of the jacket (2) and has a gap between it and the outer surface of the inner cylinder (1), and each baffle (5) has a flow hole (17); a gas distributor (6) is installed in the material inlet (9).

2. The aggregator for fumed silica production according to claim 1, characterized in that: Each group of the turbulence protrusions (4) consists of multiple protrusions evenly arranged along the circumference, and each turbulence protrusion (4) is hemispherical.

3. The aggregator for fumed silica production according to claim 1, characterized in that: The baffle plate (5) is annular, and the outer ring of the baffle plate (5) is fixed to the inner surface of the jacket (2). There is a gap between the inner ring of the baffle plate (5) and the outer surface of the inner cylinder (1).

4. The aggregator for fumed silica production according to claim 1, characterized in that: The collector is U-shaped with two horizontal openings. The heat exchange medium inlet and outlet include a main hot water inlet (11) and a main steam outlet (13). The main hot water inlet (11) is installed in the lower part of the jacket (2) and communicates with the heat exchange medium cavity near the material inlet (9). The main steam outlet (13) is installed in the upper part of the jacket (2) and communicates with the heat exchange medium cavity near the material outlet (10). The main hot water inlet (11) and the main steam outlet (13) are diagonally distributed.

5. The aggregator for fumed silica production according to claim 4, characterized in that: The jacket (2) is provided with an auxiliary hot water inlet (12) at the front end. The hot water temperature introduced into the auxiliary hot water inlet (12) is lower than that introduced into the main hot water inlet (11).

6. The aggregator for fumed silica production according to claim 5, characterized in that: The auxiliary hot water inlet (12) is installed at the lower part of the jacket (2), and the auxiliary hot water inlet (12) is located at the front end of the main hot water inlet (11) in the material flow direction and is connected to the heat exchange medium cavity near the material inlet (9); an auxiliary steam outlet (14) is also provided between the two openings of the "U" shaped collector, and the auxiliary steam outlet (14) is connected to the heat exchange medium cavity near the material inlet (9).

7. The aggregator for fumed silica production according to claim 1, characterized in that: Temperature sensor (15) and pressure sensor (16) are respectively installed on the jacket (2).

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